Furnace-door.



F. ORTH.

FURNACE DOOR.

AIPLIOATION FILED no.4, 1911.

1,071,786. Patented Sept. 2, 1913.

2 SEEETB-SHEET 1.

fi' y COLUMBIA PLANOORAPN- 60., WASHINGTON, D c,

F. ORTH.

FURNACE DOOR.

APPLICATION FILED no.4, 1911.

71,786. Patented Sept. 2, 1913 M 55 5 2 E a 1% 6 lllllllll 7 FRANK ORTH, OF INDIANA HARBOR, INDIANA.

FURNACE-D 0 OR.

Specification of Letters Patent.

Patented Sept. 2, 1913.

Application filed December 4, 1911. Serial No. 663,801.

To (all whom it may] concern:

Be it known that I, FRANK OR'III, a citizen of the United States, residing at Indiana Harbor, in the county of Lake and State of Indiana, have invented certain new and useful Improvements in Furnace-Doors, of which the following is a specification.

This invention relates to an improved construction in furnace doors, and its essential object is to produce a door construction which is economical and durable and especially adapted for open hearth and other furnaces, which work at high temperatures. In this class of work, two types of doors are at present employed, one of which is watercooled, and the other of which is not.

The present invention relates to the latter type of door construction. This improved furnace dOOr is adapted to be raised and lowered from the top by hydraulic or other motive power, and is prefe ably in sliding contact with the jambs or margins of the furnace opening.

The invention further relates to the iron supporting frame and fire-proof lining therefor.

It is the present practice to build open hearth furnace doors from separate pieces of brick, embedded in fire clay, and it is well known that said fire clay, which is used as a binder, is not as refractory as the bricks, and for this reason the joints burn out in advance of the bricks, which is a source of weakness in present constructions. Furthermore, where the door is built up from a number of separate bricks, and anyone of them becomes loose and displaced, it is necessary to discard the entire defective door lining, making it necessary to change the door. Again, the liability of separate pieces of brick becoming displaced is considerable, because of the fact that in operating the door by raising and lowering, the faces of the bricks are brought into rubbing contact with the margin of the furnace opening.

My improved door lining may be of monolithic formation made of refractory fire clay material properly burnt, or, if desired, itmay be made in several integral parts or sections in which there are no separate pieces likely to become loose and detached.

The invention further consists in the features of construction and combinations of parts hereinafter described and claimed.

In the drawings, Figure 1 is a side elevation of my improved furnace door; Fig. 2, is a section taken on line 2--2 of Fig. 1; e I u Fig. 3, 1s a section taken on line ---3 of Fig. 1; Fig. 4, is a vertical section taken through the door base; Fig. 5, is a section taken on line 55 of Fig. 1; and Fig. 6, is a section taken transversely through the door having two part lining construction.

Referring to Fig. 1, the metallic furnace door frame preferably comprises opposite side pieces 7 and S united togetheat their upper ends by a connecting rod 9, carrying a link 10 centrally thereof. The lower portions of the side pieces 7 and 8 may be recessed, as at 11, and have oppositely disposed bottom flanges 12 of a size to normally accommodate the bottom transverse section 13 which preferably has its body somewhat centrally enlarged as at. 14: and is provided, as shown, with a send-circular edge or rim 15 registering with the furnace sight hole or opening 16 in the lining, which arrangement tends to substantially strengthen and reinforce said opening and to form a support for the rod used in tapping the open hearth furnace. The op'iosite ends of the transverse section 13, as shown in Figs. 4 and 5, are formed with side walls 17 proportioned to normally lodge within the wall recesses 11, and have bolt openings 18 therein, which openings, when brought into registry with similar openings in the side pieces 7 and 8 permit of the insertion of bolts 19 thercthrough for locking the transverse base section 13 thereto. As shown, the bolt heads 20 are countersunk within the walls 17, thus permitting the base section 13 to be secured to the pieces 7 and 8 from the outside of the device. Stirrups 21 and 22 respectively, are secured to the upper ends of the pieces 7 and 8, which may merge, as usual, into a yoke, not shown; and said stirrups may be retained in bolted engagement with the openings 23 formed in the upper projecting ends of the pieces 7 and S, or otherwise as desired.

Instead of making the furnace door lining of bricks bedded with fire-clay, I prefer to make the same of monolithic formation from any suitable refractory substance or material adapted to withstand high temperatures. If desired, said furnace door lining may be formed substantially as shown in Fig. 6 comprising two separate sections 24 and 25, the section 24 having a V-shaped notched edge 26 for engaging the V-shaped edge 27 of the section 25, or otherwise. Either the monolithic or two piece lining construction, herein shown, is thoroughly practical and highly efficient in use. The door linin 28 is preferably made with an annular protuberance 29 generally placed centrally thereof, thereby permitting the lining to better withstand excessive heat temperature, as well as render the same more durable.

In F 2, it is shown that the bottom transverse frame section 13 is recessed as at 30 and has a projecting ledge 31 forming in effect a pocket for the lining which it will be noted covers and extends a substantial distance beyond the metallic frame section. In Fig. 3 is likewise shown the peculiar construction of the side pieces 7 and 8 wherein are formed similar pockets 32 and ledges 33, it being understood that the refractory lining extends a substantial. distance beyond the metallic parts. Obviously, this lining construction protects the edges of the metallic parts, no portions of which are exposed to the fire, and this I consider a feature of considerable importance.

From the above it will be seen that I have provided a furnace door frame made from separate parts but which can be readily secured together, and that said frame is peculiarly constructed to retain in place a suitable refractory lining preferably of monolithic or other section formation in which no parts of the door are normally exposed to the furnace heat. Furthermore, the peculiar construction of the bottom transverse section is of considerable importance, the semi-circular rim or edge act ing as a support forthe rod used in tapping the open hearth furnace, and at the same time protecting the lining adjacent to the opening.

It may be found desirable to reinforce the refractory lining, and for that purpose a transverse strengthening bar or brace 34 may be secured centrally through the door frame and adjacent the lining. Moreover, it is found in burning the monolithic blocks which are to be used for this door lining, that it is impossible always to burn the same to exact size, and for that reason, I have provided slots 35 in the lower side'frames to permit the base of the frame to be adjusted to size of lining. Common practice has shown that the size of the lining may vary three-eighths of an inch either way from specified size, and it is for this reason that I have made the frame base vertically adjustable, the length of the bolts 19 per mitting of the frame base being correspond ingly adjusted sidewise as does the connecting rod 9 in the upper part of the frame.

I claim:

1. In a furnace door, the combination of a door frame comprising opposite side frame sections, a top connecting rod therefor, a transverse frame base ad ustable both vertically and laterally with respect to sald side walls, and a refractory lining within the sections, a top connecting rod therefor, a

transverse frame base adjustable both vertically and laterally with respect to said side walls, and enlarged somewhat centrally for forming a protecting rim about the furnace sight hole, and a lining of'refractory ma terial provided with a sight hole within the door frame adapted to withstand high heat temperature, substantially as described.

5. In a furnace door, the combination of a door frame, and a monolithic lining within the door frame formed of refractory material, provided with a protuberance centrally on the outer side of the door lining, adapted to withstand high heat temperature, substantially as described.

4. In a device of the class described, the

combination of a pair of vertically extendlng oppositely disposed side pieces, a transverse bottom sectlon, an ad ustable connection between the lower end of each side piece and the bottom section, and a door lining mounted within and supported by all of sald sections, whereby the distance between the side pieces may be adjusted corresponding to the exact size and requlrements of the door lining, substantially as described. I 5. In a device of the class described, the

combination of a pair of vertical side pieces I having oppositely disposed facing'recesses" in their lower portions, a transverse bottom section, arearwardlyextending ear on each end of the bottom section of suitable size. to enter wlthin the recess of the correspondmg side plece, ad ustable connecting means 1 between each of said ears andthe lower end of the corresponding side piece, and a door lining mounted within and supported by all of said pieces, whereby the distance between the side pieces may be'adjusted corresponding to the exact size and requirements of the door lining, substantially as described.

6. In a device of the classdescribed, the combination of a pair of vertical side pieces having oppositely disposed recesses in their lower portions, a transverse bottom piece of L-shaped cross section, a rearwardly extending ear on each end of said bottom piece, a door lining set between the side pieces and partially supported by the horizontal arm of the L-shaped bottom piece, and adjustable connecting means between the lower ends of the side pieces and the rearwardly extending ears of the, bottom piece,

substantially as described.

7. In a device of the class described, the combination of a frame work comprising vertical side portions and a horizontal bottom portion, there being oppositely disposed vertical channels in the side portions and a horizontal channel in the bottom portion, and a door lining mounted within and supported by said frame work and having outwardly projecting ribs on its side and bottom faces for engagement with the corresponding channels of the frame work, said lining being suitably proportioned to overhang the rear edges of the frame work, whereby the frame work may be protected from excessive heat by the lining, and whereby the lining is firmly held in place by reason of the engagement of its ribs with the channels of the frame Work, substantially as described.

8. In a device of the class described, the

combination of a frame work comprising vertical side portions and a horizontal bottom portion, there being inwardly projecting ledges on the side and bottom portions, and a door lining mounted within and supported by the frame work, said lining having grooves formed in its side and bottom edges for engagement with the correspond ing ledges of the frame work, said lining projecting rearwardly of the frame work, whereby the frame work may be protected from excessive heat by the lining, and whereby the lining is held securely in place by reason of the engagement of the ledges of the frame work with the grooves of the lining, substantially as described.

FRANK ORTH. Witnesses:

WALKER BANNING, FRANCES M. Fnos'r.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

